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ffmpeg / libavformat / rpl.c @ b7effd4e

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/*
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 * ARMovie/RPL demuxer
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 * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "libavutil/avstring.h"
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#include "avformat.h"
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#include <stdlib.h>
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#define RPL_SIGNATURE "ARMovie\x0A"
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#define RPL_SIGNATURE_SIZE 8
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/** 256 is arbitrary, but should be big enough for any reasonable file. */
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#define RPL_LINE_LENGTH 256
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static int rpl_probe(AVProbeData *p)
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{
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    if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
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        return 0;
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    return AVPROBE_SCORE_MAX;
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}
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typedef struct RPLContext {
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    // RPL header data
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    int32_t frames_per_chunk;
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    // Stream position data
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    uint32_t chunk_number;
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    uint32_t chunk_part;
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    uint32_t frame_in_part;
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} RPLContext;
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static int read_line(AVIOContext * pb, char* line, int bufsize)
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{
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    int i;
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    for (i = 0; i < bufsize - 1; i++) {
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        int b = avio_r8(pb);
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        if (b == 0)
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            break;
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        if (b == '\n') {
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            line[i] = '\0';
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            return 0;
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        }
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        line[i] = b;
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    }
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    line[i] = '\0';
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    return -1;
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}
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static int32_t read_int(const char* line, const char** endptr, int* error)
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{
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    unsigned long result = 0;
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    for (; *line>='0' && *line<='9'; line++) {
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        if (result > (0x7FFFFFFF - 9) / 10)
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            *error = -1;
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        result = 10 * result + *line - '0';
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    }
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    *endptr = line;
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    return result;
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}
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static int32_t read_line_and_int(AVIOContext * pb, int* error)
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{
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    char line[RPL_LINE_LENGTH];
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    const char *endptr;
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    *error |= read_line(pb, line, sizeof(line));
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    return read_int(line, &endptr, error);
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}
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/** Parsing for fps, which can be a fraction. Unfortunately,
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  * the spec for the header leaves out a lot of details,
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  * so this is mostly guessing.
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  */
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static AVRational read_fps(const char* line, int* error)
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{
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    int64_t num, den = 1;
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    AVRational result;
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    num = read_int(line, &line, error);
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    if (*line == '.')
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        line++;
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    for (; *line>='0' && *line<='9'; line++) {
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        // Truncate any numerator too large to fit into an int64_t
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        if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
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            break;
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        num  = 10 * num + *line - '0';
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        den *= 10;
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    }
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    if (!num)
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        *error = -1;
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    av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
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    return result;
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}
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static int rpl_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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    AVIOContext *pb = s->pb;
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    RPLContext *rpl = s->priv_data;
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    AVStream *vst = NULL, *ast = NULL;
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    int total_audio_size;
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    int error = 0;
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    uint32_t i;
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    int32_t audio_format, chunk_catalog_offset, number_of_chunks;
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    AVRational fps;
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    char line[RPL_LINE_LENGTH];
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    // The header for RPL/ARMovie files is 21 lines of text
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    // containing the various header fields.  The fields are always
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    // in the same order, and other text besides the first
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    // number usually isn't important.
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    // (The spec says that there exists some significance
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    // for the text in a few cases; samples needed.)
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    error |= read_line(pb, line, sizeof(line));      // ARMovie
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    error |= read_line(pb, line, sizeof(line));      // movie name
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    av_metadata_set2(&s->metadata, "title"    , line, 0);
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    error |= read_line(pb, line, sizeof(line));      // date/copyright
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    av_metadata_set2(&s->metadata, "copyright", line, 0);
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    error |= read_line(pb, line, sizeof(line));      // author and other
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    av_metadata_set2(&s->metadata, "author"   , line, 0);
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    // video headers
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    vst = av_new_stream(s, 0);
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    if (!vst)
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        return AVERROR(ENOMEM);
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    vst->codec->codec_type      = AVMEDIA_TYPE_VIDEO;
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    vst->codec->codec_tag       = read_line_and_int(pb, &error);  // video format
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    vst->codec->width           = read_line_and_int(pb, &error);  // video width
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    vst->codec->height          = read_line_and_int(pb, &error);  // video height
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    vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error);  // video bits per sample
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    error |= read_line(pb, line, sizeof(line));                   // video frames per second
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    fps = read_fps(line, &error);
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    av_set_pts_info(vst, 32, fps.den, fps.num);
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    // Figure out the video codec
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    switch (vst->codec->codec_tag) {
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#if 0
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        case 122:
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            vst->codec->codec_id = CODEC_ID_ESCAPE122;
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            break;
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#endif
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        case 124:
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            vst->codec->codec_id = CODEC_ID_ESCAPE124;
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            // The header is wrong here, at least sometimes
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            vst->codec->bits_per_coded_sample = 16;
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            break;
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#if 0
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        case 130:
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            vst->codec->codec_id = CODEC_ID_ESCAPE130;
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            break;
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#endif
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        default:
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            av_log(s, AV_LOG_WARNING,
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                   "RPL video format %i not supported yet!\n",
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                   vst->codec->codec_tag);
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            vst->codec->codec_id = CODEC_ID_NONE;
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    }
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    // Audio headers
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    // ARMovie supports multiple audio tracks; I don't have any
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    // samples, though. This code will ignore additional tracks.
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    audio_format = read_line_and_int(pb, &error);  // audio format ID
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    if (audio_format) {
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        ast = av_new_stream(s, 0);
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        if (!ast)
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            return AVERROR(ENOMEM);
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        ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;
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        ast->codec->codec_tag       = audio_format;
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        ast->codec->sample_rate     = read_line_and_int(pb, &error);  // audio bitrate
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        ast->codec->channels        = read_line_and_int(pb, &error);  // number of audio channels
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        ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error);  // audio bits per sample
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        // At least one sample uses 0 for ADPCM, which is really 4 bits
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        // per sample.
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        if (ast->codec->bits_per_coded_sample == 0)
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            ast->codec->bits_per_coded_sample = 4;
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        ast->codec->bit_rate = ast->codec->sample_rate *
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                               ast->codec->bits_per_coded_sample *
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                               ast->codec->channels;
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        ast->codec->codec_id = CODEC_ID_NONE;
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        switch (audio_format) {
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            case 1:
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                if (ast->codec->bits_per_coded_sample == 16) {
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                    // 16-bit audio is always signed
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                    ast->codec->codec_id = CODEC_ID_PCM_S16LE;
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                    break;
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                }
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                // There are some other formats listed as legal per the spec;
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                // samples needed.
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                break;
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            case 101:
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                if (ast->codec->bits_per_coded_sample == 8) {
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                    // The samples with this kind of audio that I have
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                    // are all unsigned.
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                    ast->codec->codec_id = CODEC_ID_PCM_U8;
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                    break;
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                } else if (ast->codec->bits_per_coded_sample == 4) {
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                    ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD;
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                    break;
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                }
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                break;
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        }
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        if (ast->codec->codec_id == CODEC_ID_NONE) {
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            av_log(s, AV_LOG_WARNING,
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                   "RPL audio format %i not supported yet!\n",
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                   audio_format);
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        }
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        av_set_pts_info(ast, 32, 1, ast->codec->bit_rate);
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    } else {
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        for (i = 0; i < 3; i++)
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            error |= read_line(pb, line, sizeof(line));
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    }
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    rpl->frames_per_chunk = read_line_and_int(pb, &error);  // video frames per chunk
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    if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124)
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        av_log(s, AV_LOG_WARNING,
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               "Don't know how to split frames for video format %i. "
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               "Video stream will be broken!\n", vst->codec->codec_tag);
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    number_of_chunks = read_line_and_int(pb, &error);  // number of chunks in the file
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    // The number in the header is actually the index of the last chunk.
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    number_of_chunks++;
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    error |= read_line(pb, line, sizeof(line));  // "even" chunk size in bytes
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    error |= read_line(pb, line, sizeof(line));  // "odd" chunk size in bytes
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    chunk_catalog_offset =                       // offset of the "chunk catalog"
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        read_line_and_int(pb, &error);           //   (file index)
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    error |= read_line(pb, line, sizeof(line));  // offset to "helpful" sprite
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    error |= read_line(pb, line, sizeof(line));  // size of "helpful" sprite
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    error |= read_line(pb, line, sizeof(line));  // offset to key frame list
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    // Read the index
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    url_fseek(pb, chunk_catalog_offset, SEEK_SET);
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    total_audio_size = 0;
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    for (i = 0; i < number_of_chunks; i++) {
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        int64_t offset, video_size, audio_size;
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        error |= read_line(pb, line, sizeof(line));
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        if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64,
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                        &offset, &video_size, &audio_size))
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            error = -1;
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        av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
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                           video_size, rpl->frames_per_chunk, 0);
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        if (ast)
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            av_add_index_entry(ast, offset + video_size, total_audio_size,
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                               audio_size, audio_size * 8, 0);
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        total_audio_size += audio_size * 8;
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    }
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    if (error) return AVERROR(EIO);
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    return 0;
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}
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static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    RPLContext *rpl = s->priv_data;
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    AVIOContext *pb = s->pb;
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    AVStream* stream;
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    AVIndexEntry* index_entry;
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    uint32_t ret;
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    if (rpl->chunk_part == s->nb_streams) {
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        rpl->chunk_number++;
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        rpl->chunk_part = 0;
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    }
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    stream = s->streams[rpl->chunk_part];
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    if (rpl->chunk_number >= stream->nb_index_entries)
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        return -1;
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    index_entry = &stream->index_entries[rpl->chunk_number];
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    if (rpl->frame_in_part == 0)
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        if (url_fseek(pb, index_entry->pos, SEEK_SET) < 0)
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            return AVERROR(EIO);
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    if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
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        stream->codec->codec_tag == 124) {
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        // We have to split Escape 124 frames because there are
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        // multiple frames per chunk in Escape 124 samples.
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        uint32_t frame_size, frame_flags;
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        frame_flags = avio_rl32(pb);
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        frame_size = avio_rl32(pb);
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        if (url_fseek(pb, -8, SEEK_CUR) < 0)
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            return AVERROR(EIO);
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        ret = av_get_packet(pb, pkt, frame_size);
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        if (ret != frame_size) {
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            av_free_packet(pkt);
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            return AVERROR(EIO);
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        }
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        pkt->duration = 1;
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        pkt->pts = index_entry->timestamp + rpl->frame_in_part;
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        pkt->stream_index = rpl->chunk_part;
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        rpl->frame_in_part++;
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        if (rpl->frame_in_part == rpl->frames_per_chunk) {
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            rpl->frame_in_part = 0;
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            rpl->chunk_part++;
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        }
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    } else {
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        ret = av_get_packet(pb, pkt, index_entry->size);
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        if (ret != index_entry->size) {
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            av_free_packet(pkt);
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            return AVERROR(EIO);
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        }
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        if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
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            // frames_per_chunk should always be one here; the header
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            // parsing will warn if it isn't.
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            pkt->duration = rpl->frames_per_chunk;
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        } else {
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            // All the audio codecs supported in this container
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            // (at least so far) are constant-bitrate.
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            pkt->duration = ret * 8;
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        }
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        pkt->pts = index_entry->timestamp;
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        pkt->stream_index = rpl->chunk_part;
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        rpl->chunk_part++;
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    }
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    // None of the Escape formats have keyframes, and the ADPCM
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    // format used doesn't have keyframes.
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    if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
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        pkt->flags |= AV_PKT_FLAG_KEY;
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    return ret;
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}
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AVInputFormat ff_rpl_demuxer = {
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    "rpl",
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    NULL_IF_CONFIG_SMALL("RPL/ARMovie format"),
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    sizeof(RPLContext),
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    rpl_probe,
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    rpl_read_header,
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    rpl_read_packet,
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};