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/*
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 * Ogg muxer
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 * Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
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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/crc.h"
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#include "libavutil/random_seed.h"
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#include "libavcodec/xiph.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/flac.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "vorbiscomment.h"
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#define MAX_PAGE_SIZE 65025
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typedef struct {
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    int64_t granule;
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    int stream_index;
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    uint8_t flags;
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    uint8_t segments_count;
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    uint8_t segments[255];
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    uint8_t data[MAX_PAGE_SIZE];
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    uint16_t size;
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} OGGPage;
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typedef struct {
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    unsigned page_counter;
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    uint8_t *header[3];
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    int header_len[3];
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    /** for theora granule */
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    int kfgshift;
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    int64_t last_kf_pts;
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    int vrev;
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    int eos;
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    unsigned page_count; ///< number of page buffered
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    OGGPage page; ///< current page
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    unsigned serial_num; ///< serial number
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    int64_t last_granule; ///< last packet granule
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} OGGStreamContext;
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typedef struct OGGPageList {
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    OGGPage page;
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    struct OGGPageList *next;
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} OGGPageList;
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typedef struct {
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    OGGPageList *page_list;
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} OGGContext;
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static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
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{
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    int64_t pos = url_ftell(pb);
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    uint32_t checksum = get_checksum(pb);
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    url_fseek(pb, crc_offset, SEEK_SET);
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    avio_wb32(pb, checksum);
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    url_fseek(pb, pos, SEEK_SET);
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}
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static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
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{
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    OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
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    AVIOContext *pb;
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    int64_t crc_offset;
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    int ret, size;
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    uint8_t *buf;
84

    
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    ret = url_open_dyn_buf(&pb);
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    if (ret < 0)
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        return ret;
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    init_checksum(pb, ff_crc04C11DB7_update, 0);
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    ffio_wfourcc(pb, "OggS");
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    avio_w8(pb, 0);
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    avio_w8(pb, page->flags | extra_flags);
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    avio_wl64(pb, page->granule);
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    avio_wl32(pb, oggstream->serial_num);
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    avio_wl32(pb, oggstream->page_counter++);
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    crc_offset = url_ftell(pb);
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    avio_wl32(pb, 0); // crc
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    avio_w8(pb, page->segments_count);
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    avio_write(pb, page->segments, page->segments_count);
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    avio_write(pb, page->data, page->size);
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    ogg_update_checksum(s, pb, crc_offset);
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    put_flush_packet(pb);
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    size = url_close_dyn_buf(pb, &buf);
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    if (size < 0)
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        return size;
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    avio_write(s->pb, buf, size);
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    put_flush_packet(s->pb);
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    av_free(buf);
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    oggstream->page_count--;
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    return 0;
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}
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static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
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{
117
    if (oggstream->kfgshift)
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        return (granule>>oggstream->kfgshift) +
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            (granule & ((1<<oggstream->kfgshift)-1));
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    else
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        return granule;
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}
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static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
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{
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    AVStream *st2 = s->streams[next->stream_index];
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    AVStream *st  = s->streams[page->stream_index];
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    int64_t next_granule, cur_granule;
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130
    if (next->granule == -1 || page->granule == -1)
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        return 0;
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    next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
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                                st2->time_base, AV_TIME_BASE_Q);
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    cur_granule  = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
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                                st ->time_base, AV_TIME_BASE_Q);
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    return next_granule > cur_granule;
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}
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140
static int ogg_reset_cur_page(OGGStreamContext *oggstream)
141
{
142
    oggstream->page.granule = -1;
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    oggstream->page.flags = 0;
144
    oggstream->page.segments_count = 0;
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    oggstream->page.size = 0;
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    return 0;
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}
148

    
149
static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
150
{
151
    OGGContext *ogg = s->priv_data;
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    OGGPageList **p = &ogg->page_list;
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    OGGPageList *l = av_mallocz(sizeof(*l));
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155
    if (!l)
156
        return AVERROR(ENOMEM);
157
    l->page = oggstream->page;
158

    
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    oggstream->page_count++;
160
    ogg_reset_cur_page(oggstream);
161

    
162
    while (*p) {
163
        if (ogg_compare_granule(s, &(*p)->page, &l->page))
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            break;
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        p = &(*p)->next;
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    }
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    l->next = *p;
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    *p = l;
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170
    return 0;
171
}
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static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
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                           uint8_t *data, unsigned size, int64_t granule)
175
{
176
    OGGStreamContext *oggstream = st->priv_data;
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    int total_segments = size / 255 + 1;
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    uint8_t *p = data;
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    int i, segments, len, flush = 0;
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    // Handles VFR by flushing page because this frame needs to have a timestamp
182
    if (st->codec->codec_id == CODEC_ID_THEORA &&
183
        ogg_granule_to_timestamp(oggstream, granule) >
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        ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1) {
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        if (oggstream->page.granule != -1)
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            ogg_buffer_page(s, oggstream);
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        flush = 1;
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    }
189

    
190
    for (i = 0; i < total_segments; ) {
191
        OGGPage *page = &oggstream->page;
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        segments = FFMIN(total_segments - i, 255 - page->segments_count);
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        if (i && !page->segments_count)
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            page->flags |= 1; // continued packet
197

    
198
        memset(page->segments+page->segments_count, 255, segments - 1);
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        page->segments_count += segments - 1;
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        len = FFMIN(size, segments*255);
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        page->segments[page->segments_count++] = len - (segments-1)*255;
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        memcpy(page->data+page->size, p, len);
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        p += len;
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        size -= len;
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        i += segments;
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        page->size += len;
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        if (i == total_segments)
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            page->granule = granule;
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212
        if (page->segments_count == 255) {
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            ogg_buffer_page(s, oggstream);
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        }
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    }
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217
    if (flush && oggstream->page.granule != -1)
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        ogg_buffer_page(s, oggstream);
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    return 0;
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}
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static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
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                                        int *header_len, AVMetadata **m, int framing_bit)
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{
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    const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
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    int size;
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    uint8_t *p, *p0;
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    unsigned int count;
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    ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
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    size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
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    p = av_mallocz(size);
235
    if (!p)
236
        return NULL;
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    p0 = p;
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    p += offset;
240
    ff_vorbiscomment_write(&p, m, vendor, count);
241
    if (framing_bit)
242
        bytestream_put_byte(&p, 1);
243

    
244
    *header_len = size;
245
    return p0;
246
}
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static int ogg_build_flac_headers(AVCodecContext *avctx,
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                                  OGGStreamContext *oggstream, int bitexact,
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                                  AVMetadata **m)
251
{
252
    enum FLACExtradataFormat format;
253
    uint8_t *streaminfo;
254
    uint8_t *p;
255

    
256
    if (!ff_flac_is_extradata_valid(avctx, &format, &streaminfo))
257
        return -1;
258

    
259
    // first packet: STREAMINFO
260
    oggstream->header_len[0] = 51;
261
    oggstream->header[0] = av_mallocz(51); // per ogg flac specs
262
    p = oggstream->header[0];
263
    if (!p)
264
        return AVERROR(ENOMEM);
265
    bytestream_put_byte(&p, 0x7F);
266
    bytestream_put_buffer(&p, "FLAC", 4);
267
    bytestream_put_byte(&p, 1); // major version
268
    bytestream_put_byte(&p, 0); // minor version
269
    bytestream_put_be16(&p, 1); // headers packets without this one
270
    bytestream_put_buffer(&p, "fLaC", 4);
271
    bytestream_put_byte(&p, 0x00); // streaminfo
272
    bytestream_put_be24(&p, 34);
273
    bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
274

    
275
    // second packet: VorbisComment
276
    p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
277
    if (!p)
278
        return AVERROR(ENOMEM);
279
    oggstream->header[1] = p;
280
    bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
281
    bytestream_put_be24(&p, oggstream->header_len[1] - 4);
282

    
283
    return 0;
284
}
285

    
286
#define SPEEX_HEADER_SIZE 80
287

    
288
static int ogg_build_speex_headers(AVCodecContext *avctx,
289
                                   OGGStreamContext *oggstream, int bitexact,
290
                                   AVMetadata **m)
291
{
292
    uint8_t *p;
293

    
294
    if (avctx->extradata_size < SPEEX_HEADER_SIZE)
295
        return -1;
296

    
297
    // first packet: Speex header
298
    p = av_mallocz(SPEEX_HEADER_SIZE);
299
    if (!p)
300
        return AVERROR(ENOMEM);
301
    oggstream->header[0] = p;
302
    oggstream->header_len[0] = SPEEX_HEADER_SIZE;
303
    bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
304
    AV_WL32(&oggstream->header[0][68], 0);  // set extra_headers to 0
305

    
306
    // second packet: VorbisComment
307
    p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
308
    if (!p)
309
        return AVERROR(ENOMEM);
310
    oggstream->header[1] = p;
311

    
312
    return 0;
313
}
314

    
315
static int ogg_write_header(AVFormatContext *s)
316
{
317
    OGGStreamContext *oggstream;
318
    int i, j;
319

    
320
    for (i = 0; i < s->nb_streams; i++) {
321
        AVStream *st = s->streams[i];
322
        unsigned serial_num = i;
323

    
324
        if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
325
            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
326
        else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
327
            av_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
328
        if (st->codec->codec_id != CODEC_ID_VORBIS &&
329
            st->codec->codec_id != CODEC_ID_THEORA &&
330
            st->codec->codec_id != CODEC_ID_SPEEX  &&
331
            st->codec->codec_id != CODEC_ID_FLAC) {
332
            av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
333
            return -1;
334
        }
335

    
336
        if (!st->codec->extradata || !st->codec->extradata_size) {
337
            av_log(s, AV_LOG_ERROR, "No extradata present\n");
338
            return -1;
339
        }
340
        oggstream = av_mallocz(sizeof(*oggstream));
341
        oggstream->page.stream_index = i;
342

    
343
        if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
344
            do {
345
                serial_num = av_get_random_seed();
346
                for (j = 0; j < i; j++) {
347
                    OGGStreamContext *sc = s->streams[j]->priv_data;
348
                    if (serial_num == sc->serial_num)
349
                        break;
350
                }
351
            } while (j < i);
352
        oggstream->serial_num = serial_num;
353

    
354
        st->priv_data = oggstream;
355
        if (st->codec->codec_id == CODEC_ID_FLAC) {
356
            int err = ogg_build_flac_headers(st->codec, oggstream,
357
                                             st->codec->flags & CODEC_FLAG_BITEXACT,
358
                                             &s->metadata);
359
            if (err) {
360
                av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
361
                av_freep(&st->priv_data);
362
                return err;
363
            }
364
        } else if (st->codec->codec_id == CODEC_ID_SPEEX) {
365
            int err = ogg_build_speex_headers(st->codec, oggstream,
366
                                              st->codec->flags & CODEC_FLAG_BITEXACT,
367
                                              &s->metadata);
368
            if (err) {
369
                av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
370
                av_freep(&st->priv_data);
371
                return err;
372
            }
373
        } else {
374
            uint8_t *p;
375
            const char *cstr = st->codec->codec_id == CODEC_ID_VORBIS ? "vorbis" : "theora";
376
            int header_type = st->codec->codec_id == CODEC_ID_VORBIS ? 3 : 0x81;
377
            int framing_bit = st->codec->codec_id == CODEC_ID_VORBIS ? 1 : 0;
378

    
379
            if (ff_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
380
                                      st->codec->codec_id == CODEC_ID_VORBIS ? 30 : 42,
381
                                      oggstream->header, oggstream->header_len) < 0) {
382
                av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
383
                av_freep(&st->priv_data);
384
                return -1;
385
            }
386

    
387
            p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
388
                                        &oggstream->header_len[1], &s->metadata,
389
                                        framing_bit);
390
            if (!p)
391
                return AVERROR(ENOMEM);
392

    
393
            oggstream->header[1] = p;
394
            bytestream_put_byte(&p, header_type);
395
            bytestream_put_buffer(&p, cstr, 6);
396

    
397
            if (st->codec->codec_id == CODEC_ID_THEORA) {
398
                /** KFGSHIFT is the width of the less significant section of the granule position
399
                    The less significant section is the frame count since the last keyframe */
400
                oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
401
                oggstream->vrev = oggstream->header[0][9];
402
                av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
403
                       oggstream->kfgshift, oggstream->vrev);
404
            }
405
        }
406
    }
407

    
408
    for (j = 0; j < s->nb_streams; j++) {
409
        OGGStreamContext *oggstream = s->streams[j]->priv_data;
410
        ogg_buffer_data(s, s->streams[j], oggstream->header[0],
411
                        oggstream->header_len[0], 0);
412
        oggstream->page.flags |= 2; // bos
413
        ogg_buffer_page(s, oggstream);
414
    }
415
    for (j = 0; j < s->nb_streams; j++) {
416
        AVStream *st = s->streams[j];
417
        OGGStreamContext *oggstream = st->priv_data;
418
        for (i = 1; i < 3; i++) {
419
            if (oggstream && oggstream->header_len[i])
420
                ogg_buffer_data(s, st, oggstream->header[i],
421
                                oggstream->header_len[i], 0);
422
        }
423
        ogg_buffer_page(s, oggstream);
424
    }
425
    return 0;
426
}
427

    
428
static void ogg_write_pages(AVFormatContext *s, int flush)
429
{
430
    OGGContext *ogg = s->priv_data;
431
    OGGPageList *next, *p;
432

    
433
    if (!ogg->page_list)
434
        return;
435

    
436
    for (p = ogg->page_list; p; ) {
437
        OGGStreamContext *oggstream =
438
            s->streams[p->page.stream_index]->priv_data;
439
        if (oggstream->page_count < 2 && !flush)
440
            break;
441
        ogg_write_page(s, &p->page,
442
                       flush && oggstream->page_count == 1 ? 4 : 0); // eos
443
        next = p->next;
444
        av_freep(&p);
445
        p = next;
446
    }
447
    ogg->page_list = p;
448
}
449

    
450
static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
451
{
452
    AVStream *st = s->streams[pkt->stream_index];
453
    OGGStreamContext *oggstream = st->priv_data;
454
    int ret;
455
    int64_t granule;
456

    
457
    if (st->codec->codec_id == CODEC_ID_THEORA) {
458
        int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
459
        int pframe_count;
460
        if (pkt->flags & AV_PKT_FLAG_KEY)
461
            oggstream->last_kf_pts = pts;
462
        pframe_count = pts - oggstream->last_kf_pts;
463
        // prevent frame count from overflow if key frame flag is not set
464
        if (pframe_count >= (1<<oggstream->kfgshift)) {
465
            oggstream->last_kf_pts += pframe_count;
466
            pframe_count = 0;
467
        }
468
        granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
469
    } else
470
        granule = pkt->pts + pkt->duration;
471

    
472
    ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule);
473
    if (ret < 0)
474
        return ret;
475

    
476
    ogg_write_pages(s, 0);
477

    
478
    oggstream->last_granule = granule;
479

    
480
    return 0;
481
}
482

    
483
static int ogg_write_trailer(AVFormatContext *s)
484
{
485
    int i;
486

    
487
    /* flush current page */
488
    for (i = 0; i < s->nb_streams; i++)
489
        ogg_buffer_page(s, s->streams[i]->priv_data);
490

    
491
    ogg_write_pages(s, 1);
492

    
493
    for (i = 0; i < s->nb_streams; i++) {
494
        AVStream *st = s->streams[i];
495
        OGGStreamContext *oggstream = st->priv_data;
496
        if (st->codec->codec_id == CODEC_ID_FLAC ||
497
            st->codec->codec_id == CODEC_ID_SPEEX) {
498
            av_free(oggstream->header[0]);
499
            av_free(oggstream->header[1]);
500
        }
501
        av_freep(&st->priv_data);
502
    }
503
    return 0;
504
}
505

    
506
AVOutputFormat ff_ogg_muxer = {
507
    "ogg",
508
    NULL_IF_CONFIG_SMALL("Ogg"),
509
    "application/ogg",
510
    "ogg,ogv,spx",
511
    sizeof(OGGContext),
512
    CODEC_ID_FLAC,
513
    CODEC_ID_THEORA,
514
    ogg_write_header,
515
    ogg_write_packet,
516
    ogg_write_trailer,
517
};