* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "bytestream.h"
#include "get_bits.h"
#include "golomb.h"
#include "h264.h"
return 0;
}
+
+static int decode_extradata_ps(const uint8_t *data, int size, H264ParamSets *ps,
+ int is_avc, void *logctx)
+{
+ H2645Packet pkt = { 0 };
+ int i, ret = 0;
+
+ ret = ff_h2645_packet_split(&pkt, data, size, logctx, is_avc, 2, AV_CODEC_ID_H264);
+ if (ret < 0)
+ goto fail;
+
+ for (i = 0; i < pkt.nb_nals; i++) {
+ H2645NAL *nal = &pkt.nals[i];
+ switch (nal->type) {
+ case NAL_SPS:
+ ret = ff_h264_decode_seq_parameter_set(&nal->gb, logctx, ps);
+ if (ret < 0)
+ goto fail;
+ break;
+ case NAL_PPS:
+ ret = ff_h264_decode_picture_parameter_set(&nal->gb, logctx, ps,
+ nal->size_bits);
+ if (ret < 0)
+ goto fail;
+ break;
+ default:
+ av_log(logctx, AV_LOG_VERBOSE, "Ignoring NAL type %d in extradata\n",
+ nal->type);
+ break;
+ }
+ }
+
+fail:
+ ff_h2645_packet_uninit(&pkt);
+ return ret;
+}
+
+/* There are (invalid) samples in the wild with mp4-style extradata, where the
+ * parameter sets are stored unescaped (i.e. as RBSP).
+ * This function catches the parameter set decoding failure and tries again
+ * after escaping it */
+static int decode_extradata_ps_mp4(const uint8_t *buf, int buf_size, H264ParamSets *ps,
+ int err_recognition, void *logctx)
+{
+ int ret;
+
+ ret = decode_extradata_ps(buf, buf_size, ps, 1, logctx);
+ if (ret < 0 && !(err_recognition & AV_EF_EXPLODE)) {
+ GetByteContext gbc;
+ PutByteContext pbc;
+ uint8_t *escaped_buf;
+ int escaped_buf_size;
+
+ av_log(logctx, AV_LOG_WARNING,
+ "SPS decoding failure, trying again after escaping the NAL\n");
+
+ if (buf_size / 2 >= (INT16_MAX - AV_INPUT_BUFFER_PADDING_SIZE) / 3)
+ return AVERROR(ERANGE);
+ escaped_buf_size = buf_size * 3 / 2 + AV_INPUT_BUFFER_PADDING_SIZE;
+ escaped_buf = av_mallocz(escaped_buf_size);
+ if (!escaped_buf)
+ return AVERROR(ENOMEM);
+
+ bytestream2_init(&gbc, buf, buf_size);
+ bytestream2_init_writer(&pbc, escaped_buf, escaped_buf_size);
+
+ while (bytestream2_get_bytes_left(&gbc)) {
+ if (bytestream2_get_bytes_left(&gbc) >= 3 &&
+ bytestream2_peek_be24(&gbc) <= 3) {
+ bytestream2_put_be24(&pbc, 3);
+ bytestream2_skip(&gbc, 2);
+ } else
+ bytestream2_put_byte(&pbc, bytestream2_get_byte(&gbc));
+ }
+
+ escaped_buf_size = bytestream2_tell_p(&pbc);
+ AV_WB16(escaped_buf, escaped_buf_size - 2);
+
+ ret = decode_extradata_ps(escaped_buf, escaped_buf_size, ps, 1, logctx);
+ av_freep(&escaped_buf);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+int ff_h264_decode_extradata(const uint8_t *data, int size, H264ParamSets *ps,
+ int *is_avc, int *nal_length_size,
+ int err_recognition, void *logctx)
+{
+ int ret;
+
+ if (data[0] == 1) {
+ int i, cnt, nalsize;
+ const uint8_t *p = data;
+
+ *is_avc = 1;
+
+ if (size < 7) {
+ av_log(logctx, AV_LOG_ERROR, "avcC %d too short\n", size);
+ return AVERROR_INVALIDDATA;
+ }
+
+ // Decode sps from avcC
+ cnt = *(p + 5) & 0x1f; // Number of sps
+ p += 6;
+ for (i = 0; i < cnt; i++) {
+ nalsize = AV_RB16(p) + 2;
+ if (p - data + nalsize > size)
+ return AVERROR_INVALIDDATA;
+ ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
+ if (ret < 0) {
+ av_log(logctx, AV_LOG_ERROR,
+ "Decoding sps %d from avcC failed\n", i);
+ return ret;
+ }
+ p += nalsize;
+ }
+ // Decode pps from avcC
+ cnt = *(p++); // Number of pps
+ for (i = 0; i < cnt; i++) {
+ nalsize = AV_RB16(p) + 2;
+ if (p - data + nalsize > size)
+ return AVERROR_INVALIDDATA;
+ ret = decode_extradata_ps_mp4(p, nalsize, ps, err_recognition, logctx);
+ if (ret < 0) {
+ av_log(logctx, AV_LOG_ERROR,
+ "Decoding pps %d from avcC failed\n", i);
+ return ret;
+ }
+ p += nalsize;
+ }
+ // Store right nal length size that will be used to parse all other nals
+ *nal_length_size = (data[4] & 0x03) + 1;
+ } else {
+ *is_avc = 0;
+ ret = decode_extradata_ps(data, size, ps, 0, logctx);
+ if (ret < 0)
+ return ret;
+ }
+ return 0;
+}
+
+/**
+ * Compute profile from profile_idc and constraint_set?_flags.
+ *
+ * @param sps SPS
+ *
+ * @return profile as defined by FF_PROFILE_H264_*
+ */
+int ff_h264_get_profile(const SPS *sps)
+{
+ int profile = sps->profile_idc;
+
+ switch (sps->profile_idc) {
+ case FF_PROFILE_H264_BASELINE:
+ // constraint_set1_flag set to 1
+ profile |= (sps->constraint_set_flags & 1 << 1) ? FF_PROFILE_H264_CONSTRAINED : 0;
+ break;
+ case FF_PROFILE_H264_HIGH_10:
+ case FF_PROFILE_H264_HIGH_422:
+ case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
+ // constraint_set3_flag set to 1
+ profile |= (sps->constraint_set_flags & 1 << 3) ? FF_PROFILE_H264_INTRA : 0;
+ break;
+ }
+
+ return profile;
+}
projects / ffmpeg / blobdiff