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FFmpeg/libavformat/flacenc.c
Andreas Rheinhardt d61240f8c9 avcodec/packet_internal: Add proper PacketList struct 
Up until now, we had a PacketList structure which is actually
a PacketListEntry; a proper PacketList did not exist
and all the related functions just passed pointers to pointers
to the head and tail elements around. All these pointers were
actually consecutive elements of their containing structs,
i.e. the users already treated them as if they were a struct.

So add a proper PacketList struct and rename the current PacketList
to PacketListEntry; also make the functions use this structure
instead of the pair of pointers.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-01-04 13:16:50 +01:00

431 lines
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/*
* raw FLAC muxer
* Copyright (c) 2006-2009 Justin Ruggles
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/flac.h"
#include "libavcodec/packet_internal.h"
#include "avformat.h"
#include "avio_internal.h"
#include "flacenc.h"
#include "id3v2.h"
#include "internal.h"
#include "vorbiscomment.h"
typedef struct FlacMuxerContext {
const AVClass *class;
int write_header;
int audio_stream_idx;
int waiting_pics;
/* audio packets are queued here until we get all the attached pictures */
PacketList queue;
/* updated streaminfo sent by the encoder at the end */
uint8_t streaminfo[FLAC_STREAMINFO_SIZE];
int updated_streaminfo;
unsigned attached_types;
} FlacMuxerContext;
static int flac_write_block_padding(AVIOContext *pb, unsigned int n_padding_bytes,
int last_block)
{
avio_w8(pb, last_block ? 0x81 : 0x01);
avio_wb24(pb, n_padding_bytes);
ffio_fill(pb, 0, n_padding_bytes);
return 0;
}
static int flac_write_block_comment(AVIOContext *pb, AVDictionary **m,
int last_block, int bitexact)
{
const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
int64_t len;
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
len = ff_vorbiscomment_length(*m, vendor, NULL, 0);
if (len >= ((1<<24) - 4))
return AVERROR(EINVAL);
avio_w8(pb, last_block ? 0x84 : 0x04);
avio_wb24(pb, len);
ff_vorbiscomment_write(pb, *m, vendor, NULL, 0);
return 0;
}
static int flac_write_picture(struct AVFormatContext *s, AVPacket *pkt)
{
FlacMuxerContext *c = s->priv_data;
AVIOContext *pb = s->pb;
const AVPixFmtDescriptor *pixdesc;
const CodecMime *mime = ff_id3v2_mime_tags;
AVDictionaryEntry *e;
const char *mimetype = NULL, *desc = "";
const AVStream *st = s->streams[pkt->stream_index];
int i, mimelen, desclen, type = 0, blocklen;
if (!pkt->data)
return 0;
while (mime->id != AV_CODEC_ID_NONE) {
if (mime->id == st->codecpar->codec_id) {
mimetype = mime->str;
break;
}
mime++;
}
if (!mimetype) {
av_log(s, AV_LOG_ERROR, "No mimetype is known for stream %d, cannot "
"write an attached picture.\n", st->index);
return AVERROR(EINVAL);
}
mimelen = strlen(mimetype);
/* get the picture type */
e = av_dict_get(st->metadata, "comment", NULL, 0);
for (i = 0; e && i < FF_ARRAY_ELEMS(ff_id3v2_picture_types); i++) {
if (!av_strcasecmp(e->value, ff_id3v2_picture_types[i])) {
type = i;
break;
}
}
if ((c->attached_types & (1 << type)) & 0x6) {
av_log(s, AV_LOG_ERROR, "Duplicate attachment for type '%s'\n", ff_id3v2_picture_types[type]);
return AVERROR(EINVAL);
}
if (type == 1 && (st->codecpar->codec_id != AV_CODEC_ID_PNG ||
st->codecpar->width != 32 ||
st->codecpar->height != 32)) {
av_log(s, AV_LOG_ERROR, "File icon attachment must be a 32x32 PNG");
return AVERROR(EINVAL);
}
c->attached_types |= (1 << type);
/* get the description */
if ((e = av_dict_get(st->metadata, "title", NULL, 0)))
desc = e->value;
desclen = strlen(desc);
blocklen = 4 + 4 + mimelen + 4 + desclen + 4 + 4 + 4 + 4 + 4 + pkt->size;
if (blocklen >= 1<<24) {
av_log(s, AV_LOG_ERROR, "Picture block too big %d >= %d\n", blocklen, 1<<24);
return AVERROR(EINVAL);
}
avio_w8(pb, 0x06);
avio_wb24(pb, blocklen);
avio_wb32(pb, type);
avio_wb32(pb, mimelen);
avio_write(pb, mimetype, mimelen);
avio_wb32(pb, desclen);
avio_write(pb, desc, desclen);
avio_wb32(pb, st->codecpar->width);
avio_wb32(pb, st->codecpar->height);
if ((pixdesc = av_pix_fmt_desc_get(st->codecpar->format)))
avio_wb32(pb, av_get_bits_per_pixel(pixdesc));
else
avio_wb32(pb, 0);
avio_wb32(pb, 0);
avio_wb32(pb, pkt->size);
avio_write(pb, pkt->data, pkt->size);
return 0;
}
static int flac_finish_header(struct AVFormatContext *s)
{
int i, ret, padding = s->metadata_header_padding;
if (padding < 0)
padding = 8192;
/* The FLAC specification states that 24 bits are used to represent the
* size of a metadata block so we must clip this value to 2^24-1. */
padding = av_clip_uintp2(padding, 24);
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
AVPacket *pkt = st->priv_data;
if (!pkt)
continue;
ret = flac_write_picture(s, pkt);
av_packet_unref(pkt);
if (ret < 0 && (s->error_recognition & AV_EF_EXPLODE))
return ret;
}
ret = flac_write_block_comment(s->pb, &s->metadata, !padding,
s->flags & AVFMT_FLAG_BITEXACT);
if (ret)
return ret;
/* The command line flac encoder defaults to placing a seekpoint
* every 10s. So one might add padding to allow that later
* but there seems to be no simple way to get the duration here.
* So just add the amount requested by the user. */
if (padding)
flac_write_block_padding(s->pb, padding, 1);
return 0;
}
static int flac_init(struct AVFormatContext *s)
{
AVCodecParameters *par;
FlacMuxerContext *c = s->priv_data;
int i;
c->audio_stream_idx = -1;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
if (c->audio_stream_idx >= 0 || st->codecpar->codec_id != AV_CODEC_ID_FLAC) {
av_log(s, AV_LOG_ERROR, "Invalid audio stream. Exactly one FLAC "
"audio stream is required.\n");
return AVERROR(EINVAL);
}
par = s->streams[i]->codecpar;
c->audio_stream_idx = i;
} else if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (!(st->disposition & AV_DISPOSITION_ATTACHED_PIC)) {
av_log(s, AV_LOG_WARNING, "Video stream #%d is not an attached picture. Ignoring\n", i);
continue;
} else if (st->codecpar->codec_id == AV_CODEC_ID_GIF) {
av_log(s, AV_LOG_ERROR, "GIF image support is not implemented.\n");
return AVERROR_PATCHWELCOME;
} else if (!c->write_header) {
av_log(s, AV_LOG_ERROR, "Can't write attached pictures without a header.\n");
return AVERROR(EINVAL);
}
c->waiting_pics++;
} else {
av_log(s, AV_LOG_ERROR, "Only audio streams and pictures are allowed in FLAC.\n");
return AVERROR(EINVAL);
}
}
if (c->audio_stream_idx < 0) {
av_log(s, AV_LOG_ERROR, "No audio stream present.\n");
return AVERROR(EINVAL);
}
/* add the channel layout tag */
if (par->channel_layout &&
!(par->channel_layout & ~0x3ffffULL) &&
!ff_flac_is_native_layout(par->channel_layout)) {
AVDictionaryEntry *chmask = av_dict_get(s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK",
NULL, 0);
if (chmask) {
av_log(s, AV_LOG_WARNING, "A WAVEFORMATEXTENSIBLE_CHANNEL_MASK is "
"already present, this muxer will not overwrite it.\n");
} else {
uint8_t buf[32];
snprintf(buf, sizeof(buf), "0x%"PRIx64, par->channel_layout);
av_dict_set(&s->metadata, "WAVEFORMATEXTENSIBLE_CHANNEL_MASK", buf, 0);
}
}
return 0;
}
static int flac_write_header(struct AVFormatContext *s)
{
FlacMuxerContext *c = s->priv_data;
AVCodecParameters *par = s->streams[c->audio_stream_idx]->codecpar;
int ret;
if (!c->write_header)
return 0;
ret = ff_flac_write_header(s->pb, par->extradata,
par->extradata_size, 0);
if (ret < 0)
return ret;
if (!c->waiting_pics)
ret = flac_finish_header(s);
return ret;
}
static int flac_write_audio_packet(struct AVFormatContext *s, AVPacket *pkt)
{
FlacMuxerContext *c = s->priv_data;
uint8_t *streaminfo;
size_t streaminfo_size;
/* check for updated streaminfo */
streaminfo = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
&streaminfo_size);
if (streaminfo && streaminfo_size == FLAC_STREAMINFO_SIZE) {
memcpy(c->streaminfo, streaminfo, FLAC_STREAMINFO_SIZE);
c->updated_streaminfo = 1;
}
if (pkt->size)
avio_write(s->pb, pkt->data, pkt->size);
return 0;
}
static int flac_queue_flush(AVFormatContext *s)
{
FlacMuxerContext *c = s->priv_data;
AVPacket *const pkt = ffformatcontext(s)->pkt;
int ret, write = 1;
ret = flac_finish_header(s);
if (ret < 0)
write = 0;
while (c->queue.head) {
avpriv_packet_list_get(&c->queue, pkt);
if (write && (ret = flac_write_audio_packet(s, pkt)) < 0)
write = 0;
av_packet_unref(pkt);
}
return ret;
}
static int flac_write_trailer(struct AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int64_t file_size;
FlacMuxerContext *c = s->priv_data;
if (c->waiting_pics) {
av_log(s, AV_LOG_WARNING, "No packets were sent for some of the "
"attached pictures.\n");
flac_queue_flush(s);
}
if (!c->write_header || !c->updated_streaminfo)
return 0;
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
/* rewrite the STREAMINFO header block data */
file_size = avio_tell(pb);
avio_seek(pb, 8, SEEK_SET);
avio_write(pb, c->streaminfo, FLAC_STREAMINFO_SIZE);
avio_seek(pb, file_size, SEEK_SET);
} else {
av_log(s, AV_LOG_WARNING, "unable to rewrite FLAC header.\n");
}
return 0;
}
static void flac_deinit(struct AVFormatContext *s)
{
FlacMuxerContext *c = s->priv_data;
avpriv_packet_list_free(&c->queue);
for (unsigned i = 0; i < s->nb_streams; i++)
av_packet_free((AVPacket **)&s->streams[i]->priv_data);
}
static int flac_write_packet(struct AVFormatContext *s, AVPacket *pkt)
{
FlacMuxerContext *c = s->priv_data;
int ret;
if (pkt->stream_index == c->audio_stream_idx) {
if (c->waiting_pics) {
/* buffer audio packets until we get all the pictures */
ret = avpriv_packet_list_put(&c->queue, pkt, NULL, 0);
if (ret < 0) {
av_log(s, AV_LOG_ERROR, "Out of memory in packet queue; skipping attached pictures\n");
c->waiting_pics = 0;
ret = flac_queue_flush(s);
if (ret < 0)
return ret;
return flac_write_audio_packet(s, pkt);
}
} else
return flac_write_audio_packet(s, pkt);
} else {
AVStream *st = s->streams[pkt->stream_index];
if (!c->waiting_pics ||
!(st->disposition & AV_DISPOSITION_ATTACHED_PIC))
return 0;
/* warn only once for each stream */
if (st->nb_frames == 1) {
av_log(s, AV_LOG_WARNING, "Got more than one picture in stream %d,"
" ignoring.\n", pkt->stream_index);
}
if (st->nb_frames >= 1)
return 0;
st->priv_data = av_packet_clone(pkt);
if (!st->priv_data)
av_log(s, AV_LOG_ERROR, "Out of memory queueing an attached picture; skipping\n");
c->waiting_pics--;
/* flush the buffered audio packets */
if (!c->waiting_pics &&
(ret = flac_queue_flush(s)) < 0)
return ret;
}
return 0;
}
static const AVOption flacenc_options[] = {
{ "write_header", "Write the file header", offsetof(FlacMuxerContext, write_header), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
static const AVClass flac_muxer_class = {
.class_name = "flac muxer",
.item_name = av_default_item_name,
.option = flacenc_options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVOutputFormat ff_flac_muxer = {
.name = "flac",
.long_name = NULL_IF_CONFIG_SMALL("raw FLAC"),
.priv_data_size = sizeof(FlacMuxerContext),
.mime_type = "audio/x-flac",
.extensions = "flac",
.audio_codec = AV_CODEC_ID_FLAC,
.video_codec = AV_CODEC_ID_PNG,
.init = flac_init,
.write_header = flac_write_header,
.write_packet = flac_write_packet,
.write_trailer = flac_write_trailer,
.deinit = flac_deinit,
.flags = AVFMT_NOTIMESTAMPS,
.priv_class = &flac_muxer_class,
};
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