mirror of https://git.ffmpeg.org/ffmpeg.git
469 lines
15 KiB
C
469 lines
15 KiB
C
/*
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* Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <stdlib.h>
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "libavutil/bswap.h"
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#include "libavutil/dict.h"
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#include "libavcodec/bytestream.h"
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#include "libavcodec/get_bits.h"
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#include "libavcodec/vorbis_parser.h"
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#include "avformat.h"
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#include "flac_picture.h"
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#include "internal.h"
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#include "oggdec.h"
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#include "vorbiscomment.h"
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static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
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{
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int i, cnum, h, m, s, ms, keylen = strlen(key);
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AVChapter *chapter = NULL;
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if (keylen < 9 || sscanf(key, "CHAPTER%03d", &cnum) != 1)
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return 0;
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if (keylen <= 10) {
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if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
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return 0;
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avpriv_new_chapter(as, cnum, (AVRational) { 1, 1000 },
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ms + 1000 * (s + 60 * (m + 60 * h)),
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AV_NOPTS_VALUE, NULL);
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av_free(val);
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} else if (!strcmp(key + keylen - 4, "NAME")) {
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for (i = 0; i < as->nb_chapters; i++)
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if (as->chapters[i]->id == cnum) {
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chapter = as->chapters[i];
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break;
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}
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if (!chapter)
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return 0;
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av_dict_set(&chapter->metadata, "title", val, AV_DICT_DONT_STRDUP_VAL);
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} else
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return 0;
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av_free(key);
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return 1;
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}
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int ff_vorbis_comment(AVFormatContext *as, AVDictionary **m,
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const uint8_t *buf, int size)
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{
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const uint8_t *p = buf;
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const uint8_t *end = buf + size;
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unsigned n, j;
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int s;
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/* must have vendor_length and user_comment_list_length */
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if (size < 8)
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return AVERROR_INVALIDDATA;
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s = bytestream_get_le32(&p);
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if (end - p - 4 < s || s < 0)
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return AVERROR_INVALIDDATA;
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p += s;
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n = bytestream_get_le32(&p);
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while (end - p >= 4 && n > 0) {
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const char *t, *v;
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int tl, vl;
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s = bytestream_get_le32(&p);
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if (end - p < s || s < 0)
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break;
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t = p;
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p += s;
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n--;
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v = memchr(t, '=', s);
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if (!v)
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continue;
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tl = v - t;
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vl = s - tl - 1;
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v++;
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if (tl && vl) {
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char *tt, *ct;
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tt = av_malloc(tl + 1);
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ct = av_malloc(vl + 1);
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if (!tt || !ct) {
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av_freep(&tt);
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av_freep(&ct);
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return AVERROR(ENOMEM);
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}
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for (j = 0; j < tl; j++)
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tt[j] = av_toupper(t[j]);
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tt[tl] = 0;
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memcpy(ct, v, vl);
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ct[vl] = 0;
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/* The format in which the pictures are stored is the FLAC format.
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* Xiph says: "The binary FLAC picture structure is base64 encoded
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* and placed within a VorbisComment with the tag name
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* 'METADATA_BLOCK_PICTURE'. This is the preferred and
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* recommended way of embedding cover art within VorbisComments."
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*/
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if (!strcmp(tt, "METADATA_BLOCK_PICTURE")) {
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int ret;
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char *pict = av_malloc(vl);
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if (!pict) {
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av_log(as, AV_LOG_WARNING, "out-of-memory error. Skipping cover art block.\n");
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av_freep(&tt);
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av_freep(&ct);
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continue;
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}
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if ((ret = av_base64_decode(pict, ct, vl)) > 0)
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ret = ff_flac_parse_picture(as, pict, ret);
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av_freep(&tt);
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av_freep(&ct);
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av_freep(&pict);
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if (ret < 0) {
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av_log(as, AV_LOG_WARNING, "Failed to parse cover art block.\n");
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continue;
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}
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} else if (!ogm_chapter(as, tt, ct)) {
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if (m && av_dict_get(*m, tt, NULL, 0)) {
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av_dict_set(m, tt, ";", AV_DICT_APPEND);
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}
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av_dict_set(m, tt, ct,
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AV_DICT_DONT_STRDUP_KEY |
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AV_DICT_APPEND);
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av_freep(&ct);
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}
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}
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}
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if (p != end)
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av_log(as, AV_LOG_INFO,
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"%ti bytes of comment header remain\n", end - p);
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if (n > 0)
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av_log(as, AV_LOG_INFO,
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"truncated comment header, %i comments not found\n", n);
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ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
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return 0;
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}
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/*
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* Parse the vorbis header
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*
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* Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
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* [vorbis_version] = read 32 bits as unsigned integer | Not used
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* [audio_channels] = read 8 bit integer as unsigned | Used
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* [audio_sample_rate] = read 32 bits as unsigned integer | Used
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* [bitrate_maximum] = read 32 bits as signed integer | Not used yet
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* [bitrate_nominal] = read 32 bits as signed integer | Not used yet
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* [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
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* [blocksize_0] = read 4 bits as unsigned integer | Not Used
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* [blocksize_1] = read 4 bits as unsigned integer | Not Used
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* [framing_flag] = read one bit | Not Used
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*/
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struct oggvorbis_private {
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unsigned int len[3];
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unsigned char *packet[3];
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VorbisParseContext vp;
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int64_t final_pts;
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int final_duration;
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};
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static int fixup_vorbis_headers(AVFormatContext *as,
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struct oggvorbis_private *priv,
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uint8_t **buf)
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{
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int i, offset, len, err;
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int buf_len;
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unsigned char *ptr;
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len = priv->len[0] + priv->len[1] + priv->len[2];
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buf_len = len + len / 255 + 64;
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ptr = *buf = av_realloc(NULL, buf_len);
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if (!ptr)
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return AVERROR(ENOMEM);
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memset(*buf, '\0', buf_len);
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ptr[0] = 2;
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offset = 1;
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offset += av_xiphlacing(&ptr[offset], priv->len[0]);
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offset += av_xiphlacing(&ptr[offset], priv->len[1]);
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for (i = 0; i < 3; i++) {
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memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
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offset += priv->len[i];
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av_freep(&priv->packet[i]);
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}
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if ((err = av_reallocp(buf, offset + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
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return err;
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return offset;
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}
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static void vorbis_cleanup(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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struct oggvorbis_private *priv = os->private;
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int i;
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if (os->private)
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for (i = 0; i < 3; i++)
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av_freep(&priv->packet[i]);
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}
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static int vorbis_update_metadata(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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int ret;
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if (os->psize <= 8)
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return 0;
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/* New metadata packet; release old data. */
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av_dict_free(&st->metadata);
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ret = ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7,
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os->psize - 8);
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if (ret < 0)
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return ret;
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/* Update the metadata if possible. */
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av_freep(&os->new_metadata);
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if (st->metadata) {
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os->new_metadata = av_packet_pack_dictionary(st->metadata, &os->new_metadata_size);
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/* Send an empty dictionary to indicate that metadata has been cleared. */
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} else {
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os->new_metadata = av_malloc(1);
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os->new_metadata_size = 0;
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}
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return ret;
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}
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static int vorbis_header(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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AVStream *st = s->streams[idx];
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struct ogg_stream *os = ogg->streams + idx;
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struct oggvorbis_private *priv;
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int pkt_type = os->buf[os->pstart];
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if (!os->private) {
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os->private = av_mallocz(sizeof(struct oggvorbis_private));
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if (!os->private)
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return AVERROR(ENOMEM);
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}
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if (!(pkt_type & 1))
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return 0;
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if (os->psize < 1 || pkt_type > 5)
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return AVERROR_INVALIDDATA;
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priv = os->private;
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if (priv->packet[pkt_type >> 1])
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return AVERROR_INVALIDDATA;
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if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
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return AVERROR_INVALIDDATA;
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priv->len[pkt_type >> 1] = os->psize;
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priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
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if (!priv->packet[pkt_type >> 1])
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return AVERROR(ENOMEM);
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memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
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if (os->buf[os->pstart] == 1) {
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const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
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unsigned blocksize, bs0, bs1;
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int srate;
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int channels;
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if (os->psize != 30)
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return AVERROR_INVALIDDATA;
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if (bytestream_get_le32(&p) != 0) /* vorbis_version */
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return AVERROR_INVALIDDATA;
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channels = bytestream_get_byte(&p);
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if (st->codec->channels && channels != st->codec->channels) {
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av_log(s, AV_LOG_ERROR, "Channel change is not supported\n");
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return AVERROR_PATCHWELCOME;
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}
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st->codec->channels = channels;
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srate = bytestream_get_le32(&p);
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p += 4; // skip maximum bitrate
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st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
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p += 4; // skip minimum bitrate
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blocksize = bytestream_get_byte(&p);
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bs0 = blocksize & 15;
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bs1 = blocksize >> 4;
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if (bs0 > bs1)
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return AVERROR_INVALIDDATA;
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if (bs0 < 6 || bs1 > 13)
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return AVERROR_INVALIDDATA;
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if (bytestream_get_byte(&p) != 1) /* framing_flag */
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return AVERROR_INVALIDDATA;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = AV_CODEC_ID_VORBIS;
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if (srate > 0) {
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st->codec->sample_rate = srate;
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avpriv_set_pts_info(st, 64, 1, srate);
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}
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} else if (os->buf[os->pstart] == 3) {
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if (vorbis_update_metadata(s, idx) >= 0) {
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// drop all metadata we parsed and which is not required by libvorbis
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unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
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if (new_len >= 16 && new_len < os->psize) {
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AV_WL32(priv->packet[1] + new_len - 5, 0);
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priv->packet[1][new_len - 1] = 1;
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priv->len[1] = new_len;
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}
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}
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} else {
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int ret = fixup_vorbis_headers(s, priv, &st->codec->extradata);
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if (ret < 0) {
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st->codec->extradata_size = 0;
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return ret;
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}
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st->codec->extradata_size = ret;
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if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
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av_freep(&st->codec->extradata);
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st->codec->extradata_size = 0;
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return ret;
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}
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}
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return 1;
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}
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static int vorbis_packet(AVFormatContext *s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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struct oggvorbis_private *priv = os->private;
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int duration, flags = 0;
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/* first packet handling
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* here we parse the duration of each packet in the first page and compare
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* the total duration to the page granule to find the encoder delay and
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* set the first timestamp */
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if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
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int seg, d;
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uint8_t *last_pkt = os->buf + os->pstart;
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uint8_t *next_pkt = last_pkt;
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avpriv_vorbis_parse_reset(&priv->vp);
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duration = 0;
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seg = os->segp;
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d = avpriv_vorbis_parse_frame_flags(&priv->vp, last_pkt, 1, &flags);
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if (d < 0) {
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os->pflags |= AV_PKT_FLAG_CORRUPT;
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return 0;
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} else if (flags & VORBIS_FLAG_COMMENT) {
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vorbis_update_metadata(s, idx);
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flags = 0;
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}
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duration += d;
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last_pkt = next_pkt = next_pkt + os->psize;
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for (; seg < os->nsegs; seg++) {
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if (os->segments[seg] < 255) {
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int d = avpriv_vorbis_parse_frame_flags(&priv->vp, last_pkt, 1, &flags);
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if (d < 0) {
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duration = os->granule;
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break;
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} else if (flags & VORBIS_FLAG_COMMENT) {
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vorbis_update_metadata(s, idx);
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flags = 0;
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}
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duration += d;
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last_pkt = next_pkt + os->segments[seg];
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}
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next_pkt += os->segments[seg];
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}
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os->lastpts =
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os->lastdts = os->granule - duration;
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if (s->streams[idx]->start_time == AV_NOPTS_VALUE) {
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s->streams[idx]->start_time = FFMAX(os->lastpts, 0);
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if (s->streams[idx]->duration)
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s->streams[idx]->duration -= s->streams[idx]->start_time;
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}
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priv->final_pts = AV_NOPTS_VALUE;
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avpriv_vorbis_parse_reset(&priv->vp);
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}
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/* parse packet duration */
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if (os->psize > 0) {
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duration = avpriv_vorbis_parse_frame_flags(&priv->vp, os->buf + os->pstart, 1, &flags);
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if (duration < 0) {
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os->pflags |= AV_PKT_FLAG_CORRUPT;
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return 0;
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} else if (flags & VORBIS_FLAG_COMMENT) {
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vorbis_update_metadata(s, idx);
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flags = 0;
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}
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os->pduration = duration;
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}
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/* final packet handling
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* here we save the pts of the first packet in the final page, sum up all
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* packet durations in the final page except for the last one, and compare
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* to the page granule to find the duration of the final packet */
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if (os->flags & OGG_FLAG_EOS) {
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if (os->lastpts != AV_NOPTS_VALUE) {
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priv->final_pts = os->lastpts;
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priv->final_duration = 0;
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}
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if (os->segp == os->nsegs)
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os->pduration = os->granule - priv->final_pts - priv->final_duration;
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priv->final_duration += os->pduration;
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}
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return 0;
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}
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const struct ogg_codec ff_vorbis_codec = {
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.magic = "\001vorbis",
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.magicsize = 7,
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.header = vorbis_header,
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.packet = vorbis_packet,
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.cleanup = vorbis_cleanup,
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.nb_header = 3,
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};
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